(19)
(11) EP 0 283 999 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.01.1990 Bulletin 1990/04

(43) Date of publication A2:
28.09.1988 Bulletin 1988/39

(21) Application number: 88104491.1

(22) Date of filing: 21.03.1988
(51) International Patent Classification (IPC)4: H04N 17/02
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 24.03.1987 US 30772

(71) Applicant: TEKTRONIX, INC.
Beaverton Oregon 97077 (US)

(72) Inventor:
  • Slavin, Keith R.
    Aloha Oregon 97006 (US)

(74) Representative: Baillie, Iain Cameron et al
c/o Ladas & Parry Altheimer Eck 2
80331 München
80331 München (DE)


(56) References cited: : 
   
       


    (54) Color bar autofind


    (57) A method for automatically finding color bars within a television video signal checks for a black burst at the end of a horizontal video line to determine the appropriate color bar standard for testing. Then a reference color burst, such as the yellow color burst, is searched for in the appropriate location within the horizontal line. Related color burst locations are demodulated to produce related color angles which are checked for relationship with the reference color burst. Also the luminance amplitudes for each color burst are compared to each other to determine whether a correct amplitude relationship is present. Each horizontal line of a picture frame is tested until either the color bars are found or all the horizontal lines have been tested. The found color bars are displayed in an appropriate format together with the line number within the picture frame, or a message indicating no color bars is displayed.







    Search report